Step 4: Now right click on the first package folder, refactor and rename. Now a warning will be displayed but you go ahead and click Rename Package. After that enter your domain name for the package name.

Step 5: Now in the bottom of Android Studio it will display ‘Find Refactoring Preview’. Here click on ‘Do Refactor’

Step 6: Now it has change the package domain name of the App. Now go ahead, change the domain extension and App folder name according to your requirement:

Step 7: Now open build.gradle (Module: app) in Gradle Scripts. Here change the application id and click Sync
Now. Finally it’s done and you have successfully changed the App package name in Android Studio: